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--- detectors [2018/08/30 11:12]
pereira [Cathode Readout Drift Chambers (CRDC)]
+++ detectors [2018/10/11 19:06]
pereira [Ionization chamber]
@@ Line 33: / Line 33: @@
-Each detector consists of two 12-µm PPTA windows mounted on frames, two printed circuit boards (PCB) and an anode frame. Each PCB is made of un-masked G-10, and includes a field shaping foil (70 µg/cm^2 polypropylene with 0.1 µm of evaporated gold) to ensure a uniform field in the active region of the detector. Two G-10 spacers are laminated to the board on each side. The shaping foils are made of 1.9-mm pitch evaporated aluminum strips perpendicularly oriented to the electric field. The anode frame includes a glued cathode grounding plane, an anode wire running across the field, and a Frisch grid. Cathode pads are located in front of and behind the anode wire. The pads have a pitch of 2.54 mm. The anode frame is sandwiched between the two printed circuit boards with two spacers in between, as shown in the figure below.
+Each detector consists of two 12-µm PPTA windows mounted on frames, two printed circuit boards (PCB) and an anode frame. Each PCB is made of un-masked G-10, and includes a field shaping foil (70 µg/cm<sup>2</sup> polypropylene with 0.1 µm of evaporated gold) to ensure a uniform field in the active region of the detector. Two G-10 spacers are laminated to the board on each side. The shaping foils are made of 1.9-mm pitch evaporated aluminum strips perpendicularly oriented to the electric field. The anode frame includes a glued cathode grounding plane, an anode wire running across the field, and a Frisch grid. Cathode pads are located in front of and behind the anode wire. The pads have a pitch of 2.54 mm. The anode frame is sandwiched between the two printed circuit boards with two spacers in between, as shown in the figure below.
 {{:wiki:crdc-section.jpg?600|Cross section of a CRDCs.}}
@@ Line 52: / Line 52: @@
 ===== Ionization chamber =====
-An ionization chamber downstream of both [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]] is used to identify the Z number of the transmitted nuclei from their energy loss. The detector has an active area of approximately 30 cm x 60 cm and a depth of approximately 406 mm (16 inches). It [[Gas handling system|is filled]] with P10 gas (90% argon, 10% methane) at a typical pressure of 300 torr, although this value can be increased up to 600 torr for light nuclei. The detector consists of 16 stacked-parallel plate ion chambers with narrow anode-cathode gaps, placed along the detector’s central axis, perpendicular to the beam direction (see figure). The plates of each of these stacked chambers are constructed from 70 mg/cm<sup>2</sup> polypropylene with 0.15 µm of aluminum evaporated on each side. The entrance and exit windows of the chamber are made of 12 mg/cm<sup>2</sup> Mylar with an overlay of Kevlar filaments and epoxy.
+An ionization chamber downstream of both [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]] is used to identify the Z number of the transmitted nuclei from their energy loss. The detector has an active area of approximately 30 cm x 60 cm and a depth of approximately 406 mm (16 inches). It [[Gas handling system|is filled]] with P10 gas (90% argon, 10% methane) at a typical pressure of 300 torr, although this value can be increased up to 600 torr for light nuclei. The detector consists of 16 stacked-parallel plate ion chambers with narrow anode-cathode gaps, placed along the detector’s central axis, perpendicular to the beam direction (see figure). The plates of each of these stacked chambers are constructed from 70 µg/cm<sup>2</sup> polypropylene with 0.15 µm of aluminum evaporated on each side. The entrance and exit windows of the chamber are made of 12 mg/cm<sup>2</sup> Mylar with an overlay of Kevlar filaments and epoxy.
 {{:wiki:ion-chamber-picture.jpg?500 |Picture of the S800 ionization chamber with its alternating cathode and anode plates.}}

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